Glass-mold burnishing process and apparatus



July 3, 1923 1,460,836 7 j 5. F. ARBUCKLE GLASS MOLD BURNISHING PROCESS AND APPARATUS File d Nov. 15, 1922 ,2 Sheets-Sheet 1 IN VEN TOR A TTORNE Y July 3, 1923.

1,460,836 s. F. ARBUCKLE GI'JASS MOLD BURNISHING PROCESS AND APPARATUS Filed Nov- 15, 1922 2 SheetsSheec 2 IN VEN TOR A TTORNE Y Patented July 3, 1923.

UNITED STATES PATENT OFFICE.

SAMUEL I. ABBUCKLE. OF DETROIT, MICHIGAN, ASSIGNOR TO MONOGRAM LENS CORPORATION, 01 NEW YORK, N. Y., A CORPORATION OF DELAW ABE.

GLASS-HOLD BURNISHING PROCESS AND APPARATUS.

' Application filed November 15, 1822. Serial No. 601,002.

To all whomz'tmay concern:

Be it known that I, SAMUEL F. ARBUCKLE, a citizen of the'United States, residing at Detroit, .in the county of Wayne and State of Michigan, have invented certaln new and useful Improvements in Glass-Mold Burnishing Processes and Apparatus, of which I declare the following to be a full, clear,

- producing and continuously maintaining ac curate a mold for making glass headllghts or ribbed plates where an accurate con figuration of a predetermined construction of ribs, lenses, grooves and the like is essential.

Difiiculty is experienced in accurately producing ribbed glass by molding operations 1n quantities dueto the scale and other impurities forming on the surfaces of the mold after use any length of time. By the present 1nvention, I rovide a method and means for readily an accuratel manufactur ng and subsequently accurate y reconditioning and maintaining a glass mold by providing an accurate master cuttin tool and a smnlarly accurate mold burnishing tool of a configuration corresponding to the ribs, prisms or lenses to be produced in the glass which are the reverse replica of the matrix of the mold and so treating the mold blank by first cut-.

ting the ribs or grooves therein with the cutting tool and thereupon producing an accurate surface contour and subsequently reconditioning and accurately maintaining the configuration of the mold by aspecial master burnishing tool which likewlse accurately conforms in configuration to the exact contour desired to be produced in glass. This will clean, properly surface and burnish the mold in an exact replica thereof and the mold may be quickly, easily and continuously maintained in proper operating condition.

Various other objects are within the scope of this invention such as relate'to the arrangement of the related elements or the structure and to various details of construction and to economies of manufacture and numerous other features as will be apparent from a consideration of the drawing and related description of a form of the invention, which may be preferred, in which- Figure 1 is a plan view of a glass headlight lens produced by the present method and apparatus.

Fig. 2 is a cross section of the lens shown 1n Figure 1.

Figure 3 is a diagrammatic illustration of a glass mold with the molding matrix illustrated in place on the die.

Figures 4 and 5 represent tools which ma be employed in cutting the matrix blan to form a reverse replica thereof and give the proper contour to the matrix.

Figures 6 and 7 represent special burnishing tools which may be manipulated by hand but the burnishing edges of which will accurately' maintain the mold in proper configuration during use.

Figures 8 and 9 are side views of the tools illustrated in Figures 4, and 6, 7, respectively.

Figure 10 is a view of a miller cutter in which a plurality of cutting tools are assembled on an arbor to cut a plurality of grooves in the matrix blank in a reverse replica thereof to form the matrix.

igure 11 is an end view thereof.

Figure 12 is a view similar to Figure 10 showing the special assembly of a burnishing tool.

Figure 13 is an end view thereof.

Figure 14 is an enlarged sectional view of the lens produced by the mold and apparatus disclosed herein, drawn to scale.

Referring to Figure 1, it will be seen that in one application of the present invention I desire to produce a lens having a plurality of zoneslO, 11 and 12 of transverse ribs illustrated in Figures 2 and 14 as comprising vertical convex lenses 10', 11' and 12'. The exact contour and configurations of these lenses may correspond to those disclosed in my co-pendingapplication Serial Number 536,024. filed February 13, .1922.

The mold is diagrammatically illustrated in Figure 3 where it is seen that the mold box 15 receives the molten glass and the matrix 16, carried by the plunger 17, is pressed therein to produce-in the glass an exact reverse replica of the matrix 16. To produce this matrix from the blank, I employ master tools of the exact correct configuration such as illustrated in Figures 4 and 5, the tool 18 shown in Figure 4 forming the ribs of the zone of the glass and the tool 18' illustrated in Figure 5 forming the ribs of the'two zones 11 and 12. It will be noted that the configurations of the cutting edges of these master tools conform exactly to the lens or ribs to be produced in the glass andbring the surface of the blank matrix to a configuration correponding thereto without requiring skillful shaping of each individual rib with an ordinary tool. After the predetermined desired number of ribs are thus formed in the blank, the surface is now treated to accurately finish the same by. the use of the master burnishin tools illustrated in Figures 6 and 7. In this way the matrix 16 is given an extremely accurate sififace configuration otherwise .unobtaina e. V

1 In order to accurately maintain this accurate configuration and ermit continued use of the mold which sca es up in use and otherwise changes its accurate sha e, the master burnishing tools are now use to remove scale and impurities and refinish and reshape the matrix of the mold to. again give the required configuration thereto.

Illustrated in Figures 10 and 12 is an apparatus for simultaneously cutting a plurality of .the ribs of different zones of a glass article and simultaneously burnishing and conditioning the surface of the matrix to maintain very accurately the exact desired configuration of each individual rib of each zone in order to thereby insure a very accurate quantity production of a plurality of 'glass articles conforming exactly to the mold. Thus, it will be seen that the plurality of burnishing wheels 20 shown in Figure 12 forms a standard or master design to which each glass article shown in Figure 14 thereafter produced by the mold shown in Figure 3 will accurately and uniformly conform. The miller cutters 19 as-' sembled on the arbor 19 in Figure 10 correspond to the construction in my co-pending application, Serial No. 551,645, filed April 11, 1922. The burnishing wheels 20 may be made of any desired burnishing materlal suitable for properly and very accurately shaping the grooves in the matrix 16,- to give their final configuration includin of course an abrasive action if desired in re nement of the surface produced by the miller cutters and to likewise be used in removing all scale and impurities and accurately reconditioning the matrix 16 to its desired reconceived configuration as stated.

It w' thus be seen that I have rovided a method of producing a glass niol by pro viding a master cutting tooland reciprocating or moving the same transversely across the blank to originally cut the reverse replica of the 'tool from which the glass may mousse be formed in'combination with a similarly formed master burnishing tool reciprocated or transversely -moved t ereon to thereby add an extremely..accurate refinement heretofore impossible in making a suitable glass 7" in disclosed and the present disclosure is illustrative merely; the invention comprehending all variations thereof. 7 7

Having thus described my invention, whaF I desire to secure by United States Letters Patent and claim is:

1. The process of makingl-a mold for pro- 35 ducing a glass article whic consists in providin a tool whose cutting edge conforms exact y to the positive sha of thesurface confi ration to be produce in glass, cuttin a mo d blank to form the reverse replica 0 said tool in said blank and finishing said blank with a finishing tool whose cutting ed e is in exact configuration of a surfac'e to produced in glass.

2. The process of reconditioning or polishing a mold of the character herein indicated to remove. scale and vrecondition the same which consists in makin a finishing tool whose finishing edge con orms exactly to the contour of the molded glass article to be produced by said mold and causing 'a transverse relative movement between said mold and said tool to shape the mold to an exact reverse replica'of'said finishing tool.

3. A process of reconditioning or polishin a glass molding matrix having a plura ity of glass moldin surfaces therein which consists in provi a pluralit of burnishing tools, each burnishing tool avthe glass article to be produced by the mold and moving said tools with respect to said matrix to cause said burnishing tool to bur-. nish the matrix to an exact reverse replica thereof and simultaneously accurately conform each molding surface of said matrix.

4. The process of reconditioning or pol ishing' a mold of the character herein indicated to accurately sha 'e, remove 'scale'and recondition the same w ich consists in mak- 7 ing a master burnishing tool whose burnishing edge conforms exactly to the contour of the molded glass article to be produced by, said mold and causing atransverse movement between said mold and said tool to 1 5 form an exact reverse replica of said tool therein.

7 v5 An apparatus for reconditioning or polishing a mold of the character herein in'-' dicated to remove e and recondition the.

ing an exact configuration of a surface of 110 same, comprising a predesigned accurately an exact configuration of a surface of the formed burnishing tool whose 'burnishing glass article to be produced by the mold when edge conforms exactly to the contour of the moved transversely with respect to a matrix molded glass article to be produced by said blank to cause said burnishing tools to bur- 15 5 mold adapted for transverse movement on nish the matrix to an exact reverse replica said mold to form an exact reverse replica thereof and simultaneously accurately con- 1 of said tool in the surface of said mold. form each corelated molding surface of said 6. An apparatus for reconditioning or matrix. v polishing a las molding matrix which com- In testimony whereof, I aflix my signature. :0 10 prises an ar r, a plurality! of separate burnishing tools, each burnishing tool having SAMUEL F. ARBUCKLE. 

